Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)


Uniformity data from three fields of Fischer bromegrass, one planted in rows 31/2 feet apart and the others broadcast, were analyzed to obtain estimates of optimum size and shape of plot for use in field experimentation. Forage yields were taken on 1,296 unit plots, 31/2 X 4 feet, in each field and added together in various combinations to give different sizes and shapes of plots. Comparable variances and variances per basic unit for each plot size were then obtained by dividing between-plot variances by the number of units per plot and the square of the number of units per plot, respectively.

Dry matter percentages of samples ranged from 35.2 to 40.6 percent in the row-planting and from 32.8 to 41.5 percent in the broadcast planting in 1950. Means were 37.6 and 38.0 percent, respectively. Analyses of variance indicated that differences in dry matter percentages due to location within fields were not significant.



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